I did this with SA3D in '90/'91. It took about 1000 hours on my old
1000 :-) 
3 spheres (2 mirrored and one transparent) orbit each other
in a shower of glass raindrops...

-Brian

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]              1502098 1742734  86.2% -lh5- 6c05 Feb 18  1996 ballrain
[generic]                  235     331  71.0% -lh5- 40f0 Feb  7  1997 BallRain.readme
[generic]                  435     644  67.5% -lh5- d451 Feb  7  1997 BallRain.readme.info
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         3 files 1502768 1743709  86.2%            Feb  8  1997